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ABSTRACT

PHOTOGRAPHIC SILVER HALIDE EMULSIONS ARE SUPERSENSITIZED BY INCORPORATING IN THE EMULSION BENZIMIDAZOLOCARBOCYANINE DYES WITH UNSYMMETRICAL CARBOCYANINE DYES HAVING 1H-IMIDAZO(4,5-B)QUINOLINE NUCLEI. AN EXAMPLE IS A GELATIN-SILVER BROMOIODIDE EMULSION OF THE TYPE DESCRIBED BY TRIVELLI ET AL. (PHOT, JOURN, 79, 330 (1939)) COATED AT 300 MG./FT.2 ON A CELLULOSE ACETATE FILM BASE AND CONTAINING 0.08 MG./MOL AG OF 4,4&#39;&#39;,5,5&#39;&#39;-TETRACHLORO-1,1&#39;&#39;,3,3&#39;&#39;TETRAETHYL - BENZIMIDAZOLOCARBOCYANINE IODIDE AND 0.08 MG./MOL AG OF 1,3,3&#39;&#39;-TRIETHYL-1H-IMIDAZO(4,5-B)QUINOTHIACARBOCYANINE IODIDE. OTHER SUPERSENSITIZING DYE COMBINATIONS FOR SUCH EMULSION INCLUDE: (A) 5,5&#39;&#39;-DICHLORO1,1&#39;&#39;,3,3&#39;&#39; - TETRAMETHYLBENZIMIDAZOLOCARBOCYANINE IODIDE AND 1,3,3&#39;&#39;-TRIETHYL-1H-IMIDAZO(4,5- B)QUINOTHIACARBOCYANINE IODIDE; (B) 5,5&#39;&#39;-DICHLORO-1,1&#39;&#39;3,3&#39;&#39;-TETRAETHYLBENZIMIDAZOLOCARBOCYANINE IODIDE AND 1,3,3&#39;&#39;-TRIETHYL-1H-IMIDAZO(4,5-B)QUINOTHIACARBOCYANINE IODIDE; AND (C) 5,5&#39;&#39;,6,6&#39;&#39;TETRABROMO-1,1&#39;&#39;3,3&#39;&#39;-TETRAETHYLBENZIMIDAZOLOCARBOCYANINE IODIDE AND 1,3,3&#39;&#39;-TRIETHYL-1H-IMIDAZO(4,5-B)-QUINOTHIACARBOCYANINE IODIDE.

DEEENSTVE PUBHGATTUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oifice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JULY 20, 1971 T888 015 SUPERSENSITIZED PHbTOGlRAPHIC SILVER HALIDE EMULSIONS Norman W. Kalenda, 1669 Lake Ave., Rochester, N.Y. 14615 Filed Dec. 4, 1970, Ser. No. 95,125 Int. Cl. G030 1/28 US. Cl. 96-124 2 Sheets Drawing. 3 Pages Specification Photographic silver halide emulsions are supersensitized by incorporating in the emulsion benzimidazolocarbocyanine dyes with unsymmetrical carbocyanine dyes having lH-imidazo [4,5-b1quinoline nuclei. An example is a gelatin-silver bromoiodide emulsion of the type described by Trivelli et a1. [Phot Journ. 79, 330 (1939)] coated at 300 mgjft. on a cellulose acetate film base and containing 0.08 mg./mol Ag of 4,4,5,5'-tetrachloro-l,1,3,3' tetraethyl benzimidazolocarbocyanine iodide and 0.08 mg./mo1 Ag of 1,3,3'-triethyl-1H-imidazo[4,5-b]quinothiacarbocyanine iodide. Other supersensitizing dye combinations for such emulsion include: (a) 5,S'-dichloro- 1,1,3,3' tetramethylbenzimidazolocarbocyanine iodide and 1,3,3-triethyl-1H-imidazo [4,5 b]quinothiacarbocyanine iodide; (b) 5,5 'dichl0r0-1,1',3,3-tetraethylbenzimidazolocarbocyanine iodide and 1,3,3'-triethy1-1H-imidaz0[4,5-b] quinothiacarbocyanine iodide; and '(c) 5 ,5 ',6,6'- tetrabromo-1,l',3,3'-tetraethylbenzimidazolocarbocyanine iodide and 1,3,3-triethyl-1H-imidazo [4,5-b1-quinothiacar bocyanine iodide.

Jul 20, 1971 N. W. KALENDA SUPERSENSITIZED PHOTOGRAPHIC SILVER HALIDE EMULSIONS Filed Dec. 1, 1970 PERCENT REFLECTA/VCE W A Q Q 2 Sheets-Sheet 52 l 1 l l l l l 80 5 00 600 20 40 60 80 WAVELENGTH 0F L/GHT //V my NORMAN W K/JL END/1 INVENTOR. 

